﻿//
// PushDialog.cs
//
// Author:
//       Lluis Sanchez Gual <lluis@novell.com>
//
// Copyright (c) 2010 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Linq;
using System.Collections.Generic;
using MonoDevelop.Core;
using MonoDevelop.Components;
using System.Threading.Tasks;
using System.Threading;

namespace MonoDevelop.VersionControl.Git
{
	partial class PushDialog : Gtk.Dialog
	{
		readonly GitRepository repo;

		public PushDialog (GitRepository repo)
		{
			this.Build ();
			this.repo = repo;
			HasSeparator = false;

			this.UseNativeContextMenus ();

			changeList.DiffLoader = DiffLoader;
			var token = destroyTokenSource.Token;

			Task.Run (async () => (await repo.GetRemotesAsync (token), await repo.GetCurrentRemoteAsync (token))).ContinueWith (t => {
				if (token.IsCancellationRequested)
					return;
				var tuple = t.Result;

				var list = new List<string> (tuple.Item1.Select (r => r.Name));
				foreach (string s in list)
					remoteCombo.AppendText (s);
				remoteCombo.Active = list.IndexOf (t.Result.Item2);
			}, token, TaskContinuationOptions.NotOnCanceled, Runtime.MainTaskScheduler).Ignore ();

			UpdateChangeSet ();
		}

		public string SelectedRemote {
			get { return remoteCombo.ActiveText; }
		}

		public string SelectedRemoteBranch {
			get { return branchCombo.ActiveText; }
		}

		void UpdateRemoteBranches ()
		{
			((Gtk.ListStore)branchCombo.Model).Clear ();
			if (remoteCombo.Active == -1) {
				branchCombo.Sensitive = false;
				return;
			}
			branchCombo.Sensitive = true;
			var token = destroyTokenSource.Token;
			repo.GetRemoteBranchesAsync (remoteCombo.ActiveText).ContinueWith (t => {
				if (token.IsCancellationRequested)
					return;
				var list = t.Result;
				foreach (string s in list)
					branchCombo.AppendText (s);
				branchCombo.Active = list.IndexOf (repo.GetCurrentBranch ());
			}, token, TaskContinuationOptions.NotOnCanceled, Runtime.MainTaskScheduler).Ignore ();
		}

		void UpdateChangeSet ()
		{
			if (remoteCombo.Active == -1 || branchCombo.Active == -1) {
				changeList.Clear ();
				return;
			}
			ChangeSet changeSet = repo.GetPushChangeSet (remoteCombo.ActiveText, branchCombo.ActiveText);
			changeList.Load (changeSet);
		}

		DiffInfo[] DiffLoader (FilePath path)
		{
			return repo.GetPushDiff (remoteCombo.ActiveText, branchCombo.ActiveText);
		}

		protected virtual void OnRemoteComboChanged (object sender, System.EventArgs e)
		{
			UpdateRemoteBranches ();
		}

		protected virtual void OnBranchComboChanged (object sender, System.EventArgs e)
		{
			UpdateChangeSet ();
		}

		CancellationTokenSource destroyTokenSource = new CancellationTokenSource ();

		protected override void OnDestroyed ()
		{
			destroyTokenSource.Cancel ();
			base.OnDestroyed ();
		}
	}
}
